XT60 has a current limit of 60A. Suitable for ZERO 9 and ZERO 10X 52V and 60V.
XT90 connectors have a current limit of 100A. Suitable for ZERO 11X and higher spec models.
If you are unsure how this harness works, do check out this video below:
Generally we recommend parallel wire harnesses be used to connect two batteries that are charged to roughly the same voltage levels. If you do not want the hassle, then use a parallel solid state switch.